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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98639cef0f512b73b62ee505daf823c57cfd3c90cc420657e871e01ddcf24da' 
  AND token = 'yybTwlHaz0M64D1ojFQhnagshCLGKTThBnV8/KxcAuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}